We started by talking about the Lorentz Force Law which makes many problems with forces and magnetism make more sense in my opinion. Then looked at a Friday sheet. Did a problem with complex numbers …

## Starting to look at limits in precalculus

We looked at limits in the context of the last few weeks of precalculus. All of the functions we saw had a (single) removable discontinuity or hole. The limits were found for that point and two other …

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## Tutoring Precal for RLS, Double angle formulas and graphing trig functions

We started by looking at homework which used the double angle formula. The basic approach was to do two things, could start in either order. 1. Draw the angle with a right triangle on the xy …

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## Tutoring RLS Precalculus, trig functions and Friday sheet

We looked at some problems with trig functions, especially sum and difference formulas. For many of them, the angle does not need to be known if the sides of the triangle are known. Used the half …

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## Tutoring Precalculus, Series and Sigma Notation

We mostly looked at problems with sigma notation. At the bottom of the capital (Greek) letter Sigma, there is a variable with the starting point and at the top a finishing point if it is finite or …

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## “Is the square root of -1 equal to just 1?”

There’s a way to check that. Or any similar problem with a square root. Take what you think is the answer, 1 and square it. If you get -1, then yes, it is. If not, it isn’t. 1(1) = 1 Not -1, so no …

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